Equipment

This is the building forum for the Combat Boat 90. If you are interested in the STL's for this project, they are available to those who help me by contributing 15 Euro. Then you get access to a sub-forum where STL's, instructions and mods are located.
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Equipment

Postby admin » Fri Jan 19, 2018 4:21 pm

In this thread I want to share links to suitable equipment, primarily for this build but of course useful for other things as well.

First a very neat thing. I've been using (or trying to use) SMD LED's. That is surface mounted LED's that one can solder thin wires to and use as very tiny lamps in model builds. But anyone who have tried knows that it's a horrible task to try to solder these. But luckily you don't have to! they are apparently available with cables already attached, from E-bay:
https://www.ebay.com/itm/162452407176?ul_noapp=true

I have ordered these motors and I'm currently designing mounts for them, but I haven't tested them yet so cannot recommend them until I've tested: https://hobbyking.com/en_us/b20-40-28l- ... 030kv.html
Note: These motors have been chosen not only for their size, but because they have fairly low rpm/v for being brushless inrunners. This is important because too high RPM will overstress the water jets. These motors on 3 cells puts out a huge amount of thrust.

Servo for radar: https://hobbyking.com/en_us/hk-5320-ult ... 075kg.html
UPDATE! This did NOT work as intended, the servo overheats.
Instead I would recommend to use one of these, and you can use the board from a servo, just unsolder the motor wires from the servo board and solder these instead (polarity doesn't matter).
https://www.ebay.com/itm/DC3V-6V-12V-N2 ... -lzsdrwl6w

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joseamirandavelez
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Re: Equipment

Postby joseamirandavelez » Sat Jan 20, 2018 1:12 am

Disclaimer: I am a complete noob on this!

I was browsing hobbyking and found this motor: https://hobbyking.com/en_us/turnigy-aqu ... motor.html

It has water cooling. I guess this is beacause they get really hot since they are enclosed... Do you know about this kind of motor?

Also, since the boat uses two motors, is this size/power appropriate?
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Kjell
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Re: Equipment

Postby Kjell » Sat Jan 20, 2018 10:28 am

They look too big, Olle has bought a HobbyKing engine to test they are smaller. I'll wait for his results

//Kjell

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joseamirandavelez
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Re: Equipment

Postby joseamirandavelez » Sun Jan 21, 2018 12:58 am

Yes, they are probably too big. I am just wondering if the water cooling is required...
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Re: Equipment

Postby admin » Sun Jan 21, 2018 11:10 am

Hi,
Skärmavbild 2018-01-21 kl. 12.06.29.png
Skärmavbild 2018-01-21 kl. 12.06.29.png (96.11 KiB) Viewed 22381 times
As you can see in this picture, this is the dimensions in my motor frames. So it's designed to take a motor up to 25mm diameter inside the "frame cutouts". But if you skip these frames and build your own, you can fit a motor up to 28mm if it's allowed to rest against the hull. As you can see, it's not quite 28mm right there but the hull extends a bit downwards so if you move the motor a bit forward of that frame, you have 28mm so with that said I guess you could fit that water cooled motor without tilting it.

Another thing to keep in mind is that you don't have to have the motor inline with the impeller shaft, there are good working angled shaft couplings, like those used in car transmissions, but also more advanced ones with inset screws in both sides.

My test proved more successful than I anticipated with this little 20mm-motor I bought, so now I'm designing a motor mount for it, hope to have the design finished this eventing.

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NackNack
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Re: Equipment

Postby NackNack » Thu Jan 25, 2018 8:06 am

Hello :D

At the moment im printing all the parts, meanwhile im looking forword to the R/C. Do you guys have a list with all the R/C espacilly the ESC an the two Motors are a big question mark :D.

I have a Dxi6 remote controll, OrganeRx 720 reciever, servos and lipos. Only Thing i Need is the Motor ESC combination :D

friendly wishes and good printig

NackNack :D
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Re: Equipment

Postby Kjell » Thu Jan 25, 2018 10:10 am

See above Olles 1st post

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NackNack
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Re: Equipment

Postby NackNack » Thu Jan 25, 2018 3:31 pm

jeah thanks for the amazing help:D

Olle do you use two ESC for the two Motors or one Strong ECS?
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Re: Equipment

Postby admin » Fri Jan 26, 2018 10:33 am

Hi, I use two ESC. Not that it's mandatory, could work with one but two gives some freedom. I could think of a situation that could be problematic with only one, that is if one of the jets is cavitating or sucking air and reving up. This would give the ESC very comficting back-EMF signal so it's likely that the motors would sync out and stop, so given the low price of ESC's these days I would for sure recommend two.
If you have a shortage of channels, you can parallell connect them on the same channel. Keep in mind though that some ESC's don't like to be connected at the same time with the BEC (power supply to the receiver) so on one of them you can disconnect the red wire.

Edit: also please check my update in the first post about the radar servo, didn't work, it overheats.

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NackNack
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Re: Equipment

Postby NackNack » Fri Jan 26, 2018 11:47 am

Nice, thanks for the information.

I ordered now these components ESC https://hobbyking.com/en_us/hobby-king- ... -ubec.html
Motors https://hobbyking.com/en_us/b20-40-12l- ... 800kv.html

and another role of filament for test the cheap brand :d
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